Pembeoke d



(No Model.)

P.-D. HARTON SAFETY ATTACHMENT FOB. ELEVATORS.

Patented Mar. 21, 1882,

N. PETERS, PIvMzrLilhngnphur. wasnin wn. 0,6.

UNITED STATES PATENT OFFICE.

PEMBROKE D. HARTON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF TWO-THIRDS TO CHARLES K. BULLOCK, OF SAME PLACE.

SAFETY ATTACHMENT FOR ELEVATORS.

SPECIFICATION formingpart of Letters Patent No. 255,110, dated March 21, 1882.

Applicati n filed August 9, 1881.

To all whom it man concern:

Be it known that I, PEMBROKE l). HARTON, of the city and county of Philadelphia, in the State of Pennsylvania, have invented an -In1- 5 provement in Safety Attachments for Elevators, of which the following is a specification.

My invention has reference to safety attachments for elevators; and it consists in dispensing with the spring heretofore used to throw the clutch-levers into the racks when the cable should break, and in lieu thereof using a positively-operatingdevice consisting of at cable attached at the bottom to the latching device, and passing over a. deeply-grooved idlerwheel atthe top ,and attached'to a weight; further, in a brake orfriction band adapted to be put in action to retard the revolution of the idler pulley or wheel upon the breaking of the elevating-cable; and in minor details of con- 7 struction, all of which are fully set forth in the following specification and shown in the aceompanying drawings, which form part thereof.

The object of this invention is to insure the arrest of the falling cage by providing a positive checking device in lieu of the spring here tofore used. By the construction herein set forth the greater the fall of the cage the greater is the force exerted to throw the clutch-levers into contact with the racks secured to the 0 guide-posts.

Heretofore springs have been used to pull down the long ends of the levers upon the elevatin g-cable being severed, which action forced the short ends'of the levers into the rack teeth.

5 In practice, however, it is found that in many cases the springs lose their power after being compressed for along time, and will not work. In this case no spring is used, and the checking device is only thrown in to action upon the 40 breaking of the elevating-cable.

In the drawings, Figure 1 is an elevation of an elevator embodying in it my invention.

(No model.)

with the usual rac as, BB. The elevating-cable D passes over the sheave P and supports the cage 0, which is furnished with the usual safety-levers, E, which are thrown in and out of action with the rack-teeth by the pie. e F, which is connected at the top tothe cableD and at the bottom to the lever G by link H. The other end of said lever G is connected to the safety-cable I, which passes over the idlerwheel K at the top, and is secured to a weight,

J, whereby the cable is pressed into the V- groove k on the face of the wheel K.

If desired, the cable I may pass around a wheel, G, and be directly connected to the safety-levers or the piece F, the wheel being 'up or down without moving the lever.

The operation is as follows: If the cable D should break, the leverNdrops down and puts the brake M on the wheel K, arresting its movement, whereupon the cable I pulls up the end of the lever G and forces the teeth of the safetylevers E into the teeth of the racks B, arresting the descending cage C. The groove is in the wheel K is made acute enough to make the cable I-bind tightly therein should the wheel be held from revolution.

The brake is not necessary to my invention, yet I prefer to use the same, as it renders the elevator safer.-

While ordinarily running the weight J has not suficient power to put the safety-teeth in action, and as the brake is off the wheelKthe 0 cable I travels back and forth over the said wheel as the cage ascends and descends.

I do not limit myself to any particular safetylatch, as my invention is equally adapted to in'sureproper action to several of such latches 9 5 in public use; but I prefer the one-shown.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. Asafetyattachment for elevators, consisting of a cable, one end of which is secured to and combined with the latching mechanism adapted to arrest the descending cage, and the other to a weight,iu combination with a grooved wheel, over which said cable travels upon the ascent or descent of the cage, a brake to arrestor retard the rotation of said grooved wheel, and means to put said brake in action upon the falling of the cage, substantially as and for the purpose specified.

2. In a safety attachment for elevators, the l sheave P, elevating-cable D, cage 0, with its safety-latch, in combination with the safetycable I, means to connect said cable with the latch, grooved pulley K weight J, lever N, carrying on its end an idler-pulley, O, and a brake ad apted to be operated by any inovemen t ofsaid lever to arrest the movement; of the grooved pulley, substantially as and for the purpose specified.

In testimony of which invention 1 hereunto Set'my hand.

PEMBROKE D. HARTON.

Witnesses:

R. M. HUNTER,

Tuos. J. HUNT. 

